Popcorn machine



FIG. 1 is a front, top and right-side-perspective view of a popcorn machine;

FIG. 2 is a front-elevational view thereof;

FIG. 3 is a rear-elevational view thereof;

FIG. 4 is a right side-elevational view thereof;

FIG. 5 is a left-side-elevational view thereof;

FIG. 6 is a top-plan view thereof; and,

FIG. 7 is a bottom-plan view thereof.

The broken lines shown in the drawings are shown for illustrative purposes only and form no part of the claimed design. In addition, the surface shading, if any, illustrated in the drawings is provided merely to highlight the contour of the design; it is not intended to be illustrative of texture or gloss. 

The ornamental design for a popcorn machine, as shown and described. 